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信号量(了解):也是一把锁semaphore
1.
from threading import Thread,Semaphore,currentThreadimport time#定义信号量(3把锁)sm = Semaphore(3)def task():with sm:print('%s acquires the sm' % currentThread().getName())time.sleep(1)if __name__ == '__main__':for i in range(10):t = Thread(target=task)t.start()
2.
sm.acquire()print('%s acquires the sm'%currentThread().getName())sm.release()#等价于with sm:print('%s acquires the sm'%currentThread().getName())